JP4157749B2 - Manufacturing method of fiber reinforced cement board - Google Patents
Manufacturing method of fiber reinforced cement board Download PDFInfo
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- JP4157749B2 JP4157749B2 JP2002326086A JP2002326086A JP4157749B2 JP 4157749 B2 JP4157749 B2 JP 4157749B2 JP 2002326086 A JP2002326086 A JP 2002326086A JP 2002326086 A JP2002326086 A JP 2002326086A JP 4157749 B2 JP4157749 B2 JP 4157749B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Producing Shaped Articles From Materials (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、白華現象を生じにくい繊維強化セメント板の製造方法に関するものである。
【０００２】
【従来の技術】
繊維強化セメント板は、主原料としてポルトランドセメント等のセメントを使用することから白華（エフロレッセンスともいう）現象を生じやすい。白華現象とは、セメントの水和反応によって生じた遊離石灰等が、繊維強化セメント板に含まれる含水分に溶出し、乾燥に伴って表面に移動して表面上に析出する現象である。白華現象は、繊維強化セメント板の外観を著しく損なうので外観不良の原因となる。また、繊維強化セメント板の表面に塗料を塗装する場合、白華現象があると塗膜剥離の原因となる等の問題もある。
【０００３】
白華現象を防止するための手段としては、白華防止剤を使用することが一般的である。白華防止剤としては、例えば脂肪族系、脂環族系、芳香族系の爆発しにくい液状炭化水素、ハロゲン化炭化水素、鉱物油等が公知であり（特許文献１）、シリカ分９０％以上で可溶性成分の多いシリカ質混合材の効果も公知である（非特許文献１）。
【０００４】
従って、繊維強化セメント板の原料として、セメントとともにフライアッシュやシリカフュームのような非晶質シリカ原料を併用すれば白華現象は減少する。セメントとともにフライアッシュやシリカフューム等の非晶質シリカ原料を併用した繊維強化セメント板の製造方法については多くの方法が提案されている（例えば特許文献２）が、単にセメントとともにフライアッシュやシリカフューム等の非晶質シリカを併用しただけでは白華現象を十分に低減することはできなかった。
【０００５】
また、特許文献３には、繊維とセメントを主原料とし、この主原料を含む材料を水で分散させてスラリーとし、脱水・成形を行うことにより製品形状を作り、その後、養生にて硬化させて繊維強化セメントからなる無機硬化体を製造する方法において、スラリーに遅延剤を所定量添加し、湿熱養生後に、１３０度以上２時間以上のオートクレーブ養生を行うことを特徴とする無機硬化体の製造方法が開示されている。しかし、この技術は、必要に応じてセメントの反応を遅らせることができるものでありながら、最終工程では十分な硬化が得られる無機硬化体の製造方法に関するものであり、遅延剤はセメントの硬化反応を遅らせる目的で使用されているだけであり、また、非晶質シリカ原料と遅延剤とを併用しているわけでもないので、十分な白華防止効果が得られるわけでもない。
【０００６】
【特許文献１】
特開昭４９−１２８０２０号公報
【特許文献２】
特開昭６１−２６５４４号公報
【特許文献３】
特開２００２−２５５６７１号公報
【非特許文献１】
賓迫晏，「エフロレッセンス」，コンクリート技術者のためのセメント化学雑論，社団法人セメント協会，昭和６０年５月増補第１版，Ｐ．６１−６５
【０００７】
【発明が解決しようとする課題】
従って、本発明の目的は、白華現象が生じにくい繊維強化セメント板の製造方法を提供することにあり、本発明者らは、非晶質シリカ原料と遅延剤とを併用することにより上記課題を解決できることを見出し本発明を完成した。
【０００８】
【課題を解決するための手段】
上記課題を解決するために、本発明は、少なくともセメント原料、繊維原料及び非晶質シリカ原料を必須原料とするとともに必要に応じて充填材を含む原料に、水を加え混合して原料スラリーを調整し、該原料スラリーを抄造法により板状に成形してグリーンシートを得、該グリーンシートを養生硬化してなる繊維強化セメント板の製造方法において、原料スラリーを調整する際に、セメント原料と非晶質シリカ原料とを合計した質量に対して、外割で０．０３質量％以上２質量％以下の範囲で遅延剤を添加することを特徴とする繊維強化セメント板の製造方法を提供するものである。また本発明は、前記遅延剤がリグニンスルホン酸系遅延剤及び／又はオキシカルボン酸系遅延剤であることを特徴とする前記の繊維強化セメント板の製造方法を提供するものである。
【０００９】
【発明の実施の形態】
以下、本発明をさらに説明する。
本発明は、セメント原料、繊維原料及び非晶質シリカ原料を必須原料とするものであるが、必要に応じて後述する充填材を原料として配合することができる。セメント原料としては、普通ポルトランドセメント、早強ポルトランドセメント等のポルトランドセメントが好適である。セメント原料が原料全体に占める配合割合は、３０〜７０質量％が好適である。セメント原料の配合割合が３０質量％未満であると得られる繊維強化セメント板の強度が不十分となることから好ましくなく、一方、セメント原料の配合割合がを７０質量％越えると白華現象の低減が不十分となることから好ましくない。
【００１０】
繊維原料は特に制限を受けるものではないが、従来の繊維強化セメント板における代表的な繊維原料であった石綿は、健康問題への影響が指摘されていることから使用しないことが望ましい。石綿を使用しない場合の繊維原料としては、セルロースパルプと合成有機繊維とを併用することが好適である。合成有機繊維としては、例えばＰＶＡ繊維、ＰＡＮ繊維、アラミド繊維等を使用することができる。繊維原料として石綿を使用しない場合、繊維原料が原料全体に占める配合割合は、セルロースパルプ２〜１０質量％、好ましくは３〜８質量％の範囲内であり、合成有機繊維０．５〜３質量％、好ましくは１〜３質量％の範囲内である。セルロースパルプの配合量が２質量％未満では、十分な強度を有する繊維強化セメント板が得られないために好ましくなく、また、セルロースパルプの配合割合が１０質量％を越えると、繊維強化セメント板の不燃性能が低下するために好ましくない。また、合成有機繊維の配合割合が０．５質量％未満であると、十分な強度を有する繊維強化セメント板が得られないために好ましくなく、更に、合成有機繊維の配合比率が３質量％を越えると、繊維強化セメント板の不燃性能が低下するために好ましくない。
【００１１】
非晶質シリカ原料は、セメントとの反応性に富むものが好ましい。好ましい非晶質シリカ原料としては、例えばシリカヒュームやフライアッシュがある。非晶質シリカ原料が原料に占める配合割合は、１０〜４０質量％であることが好ましい。非晶質シリカ原料が原料全体に占める配合割合が１０質量％未満であると、十分な白華現象の防止効果が得られないことから好ましくなく、また、非晶質シリカ原料が原料に占める配合割合が４０質量％を越えると、十分な強度を有する繊維強化セメント板が得られないために好ましくない。
【００１２】
本発明においては、上記非晶質シリカ原料と遅延剤とを併用することが重要である。本発明に使用する遅延剤としては、グルコン酸塩、ポリオール高分子複合体、水溶性高分子（メチルセルロース、メチルセルロース誘導体、ポリビニルアルコール、デキストリン、ポリアクリル酸ソーダ）、珪フッ化物（珪フッ化ソーダ）、リン酸塩、硼酸塩、酸化亜鉛、塩化亜鉛、酸化鉛、酸化硼素、硼砂、リグニンスルホン酸塩（リグニンスルホン酸カルシウム、リグニンスルホン酸ナトリウム）、芳香族スルホン化物、オキシカルボン酸、アミノカルボン酸等が好適であり、特にリグニン系遅延剤、カルボン酸系遅延剤が好適である。なお、前記遅延剤は２種類以上を併用してもよい。遅延剤の添加量は、セメント原料と非晶質シリカ原料とを合計した質量に対して、外割で０．０３〜２質量％の範囲が好適である。遅延剤の添加量がセメント原料と非晶質シリカ原料とを合計した質量に対して外割で０．０３質量％未満であると、十分な白華防止効果が得られないことから好ましくなく、また、遅延剤の添加量がセメント原料と非晶質シリカ原料とを合計した質量に対して外割で２質量％を越えると、セメントの水和反応が遅延されて養生硬化に長時間を要し生産効率が低下するので好ましくない。
【００１３】
本発明においては、必須原料であるセメント原料、繊維原料及び非晶質シリカ原料の他に、必要に応じて以下の充填材を原料として使用することができる。
▲１▼ウォラストナイト、トバモライト、ゾノトライト等の珪酸カルシウム粉末；
▲２▼マスコバイト、バイオタイト、パラゴナイト、セリサイト等の雲母鉱物粉末；
▲３▼パーライト、炭酸カルシウム等の無機質増量材粉末；
▲４▼ベントナイト、カオリナイト、バーミキュライト等の粘土鉱物粉末；
▲５▼パリゴルスカイト、セピオライト等の繊維質鉱物粉末；
▲６▼ゼオライト等の多孔質鉱物粉末。
上記充填材が原料全体に占める配合割合は、４０質量％以下好ましくは３５質量％以下である。充填材が４０質量％を越えると十分な強度を有する繊維強化セメント板が得られないので好ましくない。
【００１４】
上記のような配合を有する原料に水を添加して混合し原料スラリーを調整するが、遅延剤は原料配合に添加する水に予め加えておくか、あるいは水を添加する際に同時に添加するのがよい。調整された原料スラリーの固形分濃度は２〜２７質量％、好ましくは３〜２２質量％の範囲内である。ここで、原料スラリーの固形分濃度が２質量％未満であると、生産効率が低下するために好ましくない。また、該固形分濃度が２７質量％を越えると、均一は繊維強化セメント板が得られないことがあるために好ましくない。調整された原料スラリーを抄造してグリーンシートを得る。抄造方法として公知の方法を使用すればよく、丸網抄造法、長網抄造法、フローオン法等を使用することができる。
【００１５】
抄造して得られたグリーンシートは、必要に応じて加圧成形を行い、養生・硬化して繊維強化セメント板を得ることができる。グリーンシートを加圧成形する場合、複数枚のグリーンシートを積層して加圧成形しることにより、通常の抄造法では得にくい厚さを有する繊維強化セメント板を得ることもできる。また、板の形状は平板状でもよく波形等の形状でもよい。養生方法としては、普通養生、スチーム養生、オートクレーブ養生等公知の養生方法を使用することができる。なお、得られた繊維強化セメント板は、必要に応じて含水率を調整するための乾燥が施される。
【００１６】
【実施例】
以下に実施例を挙げて、本発明の繊維強化セメント板の製造方法を更に説明する。
実施例１
セメント原料として普通ポルトランドセメント５０質量％、繊維原料としてセルロースパルプ（ＮＢＫＰ）５質量％及びＰＶＡ繊維（クラレ社製ビニロン、長さ６ｍｍ）２質量％、非晶質シリカ原料としてフライアッシュ（太平洋セメント社製スーパーフロー）２２質量％、並びに充填材として炭酸カルシウム粉末２０質量％を準備した。上記原料に水を添加する際に、同時にオキシカルボン酸系遅延剤であるグルコン酸ナトリウムを普通ポルトランドセメントとフライアッシュとの合計量７２質量％に対して外割で０．１４質量％添加し、混合して固形分濃度８質量％の原料スラリーを調整した。配合原料の量は１配合につき６００ｋｇとした。
次に、調整した原料スラリーを丸網抄造機により抄造して厚さ７．２ｍｍのグリーンシートを得、これを２１．８ＭＰａの圧力で加圧成形した後、８０℃で１５時間のスチーム養生を行って硬化させ、硬化後１２０℃で加熱乾燥して含水率を約１０％に調整し、四周を切断して、幅９１０ｍｍ×長さ１８２０ｍｍ×厚さ６ｍｍの平板状の繊維強化セメント板を得た。抄造は５配合を行い、得られた繊維強化セメント板の枚数は１５０枚であった。
得られた繊維強化セメント板１００枚について表面を目視観察した結果、白華現象は観察されなかった。また、壁材として２０枚を試験施工したところ色違い等の問題も認められなかった。なお、得られた繊維強化セメント板について、ＪＩＳ Ａ ５４３０に基づいてかさ密度と曲げ強度を測定した結果、かさ密度は１．６２ｇ／ｃｍ３で、曲げ強度は３１．４Ｎ／ｍｍ２であり、繊維強化セメント板として十分な強度を有していることが確認できた。
【００１７】
比較例１
遅延剤を使用しなかったことを除き、実施例１と同一条件にて平板状の繊維強化セメント板１５０枚を得た。得られた繊維強化セメント板１００枚について表面を目視観察した結果、１５枚に白華現象が認められ、そのうち１枚は白華現象が著しく、不良品に該当するものであった。また、壁材として２０枚を試験施工したところ不良には該当しないものの多少の色違いが認められた。なお、得られた繊維強化セメント板について、ＪＩＳ Ａ ５４３０に基づいてかさ密度と曲げ強度を測定した結果、かさ密度は１．６４ｇ／ｃｍ３で、曲げ強度は３１．３Ｎ／ｍｍ２であり、実施例１と物性上の差異は認められなかった。
【００１８】
【発明の効果】
本発明によれば、非晶質シリカ原料と遅延剤とを併用することにより、公知の抄造法を使用して、白華現象を生じにくい繊維強化セメント板を容易に製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a fiber-reinforced cement board that is less likely to cause white flower.
[0002]
[Prior art]
The fiber reinforced cement board tends to cause a white flower (also referred to as efflorescence) phenomenon because it uses cement such as Portland cement as a main raw material. The white flower phenomenon is a phenomenon in which free lime or the like generated by the hydration reaction of cement is eluted into the moisture content contained in the fiber reinforced cement board, moves to the surface as it dries, and precipitates on the surface. The white flower phenomenon significantly deteriorates the appearance of the fiber-reinforced cement board, and causes a poor appearance. In addition, when a paint is applied to the surface of a fiber reinforced cement board, there is a problem that if there is a white flower phenomenon, it causes peeling of the coating film.
[0003]
As a means for preventing the white flower phenomenon, it is common to use a white flower preventing agent. For example, aliphatic, alicyclic, and aromatic liquid hydrocarbons, halogenated hydrocarbons, mineral oils, and the like that are difficult to explode are known (Patent Document 1), and the silica content is 90%. The effect of the siliceous mixed material having many soluble components is also known (Non-Patent Document 1).
[0004]
Therefore, if an amorphous silica raw material such as fly ash or silica fume is used in combination with cement as a raw material for the fiber reinforced cement board, the white flower phenomenon is reduced. Many methods have been proposed for producing a fiber-reinforced cement plate using amorphous silica materials such as fly ash and silica fume together with cement (for example, Patent Document 2). The white flower phenomenon could not be sufficiently reduced only by using amorphous silica together.
[0005]
In Patent Document 3, fibers and cement are used as main raw materials, and the material containing the main raw materials is dispersed in water to form a slurry, which is dehydrated and molded to form a product shape, which is then cured by curing. In a method for producing an inorganic cured body made of fiber reinforced cement, a predetermined amount of a retarder is added to the slurry, and after wet heat curing, an autoclave curing is performed at 130 ° C. or more for 2 hours or more. A method is disclosed. However, this technology relates to a method for producing an inorganic cured body that can obtain sufficient curing in the final step, while being able to delay the cement reaction as required. It is only used for the purpose of delaying, and since the amorphous silica raw material and the retarder are not used in combination, a sufficient whitening prevention effect is not obtained.
[0006]
[Patent Document 1]
JP-A-49-128020 [Patent Document 2]
Japanese Patent Laid-Open No. 61-26544 [Patent Document 3]
JP 2002-255671 [Non-Patent Document 1]
Tsuyoshi Kosako, "Eflorescence", Cement chemical miscellaneous theory for concrete engineers, Japan Cement Association, Aug. 1960 supplement, 1st edition 61-65
[0007]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a method for producing a fiber-reinforced cement board in which the white flower phenomenon is unlikely to occur, and the present inventors have used the above-mentioned problem by combining an amorphous silica raw material and a retarder. The present invention has been completed.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention uses at least a cement raw material, a fiber raw material, and an amorphous silica raw material as essential raw materials, and optionally adds water to a raw material containing a filler and mixes the raw material slurry. In the manufacturing method of the fiber reinforced cement board formed by forming and sheeting the raw material slurry into a plate shape by a papermaking method, and curing and curing the green sheet, when adjusting the raw material slurry, Provided is a method for producing a fiber-reinforced cement board, characterized in that a retarder is added in a range of 0.03% by mass or more and 2% by mass or less as an outer percentage with respect to the total mass of amorphous silica raw materials. Is. In addition, the present invention provides the method for producing a fiber-reinforced cement board, wherein the retarder is a lignin sulfonic acid retarder and / or an oxycarboxylic acid retarder.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be further described below.
In the present invention, a cement raw material, a fiber raw material, and an amorphous silica raw material are used as essential raw materials. If necessary, a filler described later can be blended as a raw material. As the cement raw material, portland cement such as ordinary portland cement and early-strength portland cement is suitable. The mixing ratio of the cement raw material to the entire raw material is preferably 30 to 70% by mass. If the blending ratio of the cement raw material is less than 30% by mass, the strength of the fiber reinforced cement board obtained is not preferable, and if the blending ratio of the cement raw material exceeds 70% by mass, the white flower phenomenon is reduced. Is not preferable because it becomes insufficient.
[0010]
The fiber raw material is not particularly limited, but it is desirable not to use asbestos, which is a typical fiber raw material in the conventional fiber reinforced cement board, because the influence on health problems is pointed out. As a fiber raw material when asbestos is not used, it is preferable to use cellulose pulp and synthetic organic fiber in combination. As the synthetic organic fiber, for example, PVA fiber, PAN fiber, aramid fiber or the like can be used. When asbestos is not used as the fiber raw material, the mixing ratio of the fiber raw material to the whole raw material is in the range of 2 to 10% by weight, preferably 3 to 8% by weight of the cellulose pulp, and 0.5 to 3% by weight of the synthetic organic fiber. %, Preferably in the range of 1 to 3% by weight. When the blending amount of the cellulose pulp is less than 2% by mass, a fiber-reinforced cement board having sufficient strength cannot be obtained, and when the blending ratio of the cellulose pulp exceeds 10% by mass, the fiber-reinforced cement board is not preferable. This is not preferable because the nonflammable performance is lowered. Further, if the blending ratio of the synthetic organic fiber is less than 0.5% by mass, it is not preferable because a fiber-reinforced cement board having sufficient strength cannot be obtained, and further, the blending ratio of the synthetic organic fiber is 3% by mass. Exceeding this is not preferable because the nonflammable performance of the fiber-reinforced cement board is lowered.
[0011]
The amorphous silica raw material is preferably rich in reactivity with cement. Preferred amorphous silica raw materials include, for example, silica fume and fly ash. The blending ratio of the amorphous silica raw material to the raw material is preferably 10 to 40% by mass. If the blending ratio of the amorphous silica raw material to the whole raw material is less than 10% by mass, it is not preferable because a sufficient effect of preventing the white flower phenomenon cannot be obtained, and the blending of the amorphous silica raw material to the raw material is not preferable. If the ratio exceeds 40% by mass, a fiber-reinforced cement board having sufficient strength cannot be obtained, which is not preferable.
[0012]
In the present invention, it is important to use the amorphous silica raw material and a retarder in combination. As the retarder used in the present invention, gluconate, polyol polymer complex, water-soluble polymer (methyl cellulose, methyl cellulose derivative, polyvinyl alcohol, dextrin, sodium polyacrylate), silicofluoride (sodium silicofluoride) , Phosphate, borate, zinc oxide, zinc chloride, lead oxide, boron oxide, borax, lignin sulfonate (calcium lignin sulfonate, sodium lignin sulfonate), aromatic sulfonate, oxycarboxylic acid, aminocarboxylic acid In particular, lignin type retarders and carboxylic acid type retarders are preferred. Two or more retarders may be used in combination. The addition amount of the retarder is preferably in the range of 0.03 to 2% by mass based on the total mass of the cement raw material and the amorphous silica raw material. When the addition amount of the retarder is less than 0.03% by mass with respect to the total mass of the cement raw material and the amorphous silica raw material, it is not preferable because a sufficient whitening prevention effect cannot be obtained, Moreover, if the amount of the retarder added exceeds 2% by mass with respect to the total mass of the cement raw material and the amorphous silica raw material, the cement hydration reaction is delayed and a long time is required for curing and curing. However, it is not preferable because production efficiency is lowered.
[0013]
In the present invention, the following fillers can be used as raw materials as necessary in addition to the essential raw materials such as cement raw materials, fiber raw materials and amorphous silica raw materials.
(1) Calcium silicate powders such as wollastonite, tobermorite, zonotrite;
(2) Mica mineral powders such as mascobite, biotite, paragonite and sericite;
(3) Inorganic filler powder such as perlite and calcium carbonate;
(4) Clay mineral powders such as bentonite, kaolinite and vermiculite;
(5) Fibrous mineral powders such as palygorskite and sepiolite;
(6) Porous mineral powder such as zeolite.
The blending ratio of the filler to the whole raw material is 40% by mass or less, preferably 35% by mass or less. If the filler exceeds 40% by mass, a fiber-reinforced cement board having sufficient strength cannot be obtained, which is not preferable.
[0014]
The raw material having the above composition is added with water and mixed to adjust the raw material slurry, but the retarder is added in advance to the water added to the raw material composition, or is added simultaneously with the addition of water. Is good. The solid content concentration of the adjusted raw slurry is in the range of 2 to 27% by mass, preferably 3 to 22% by mass. Here, when the solid content concentration of the raw slurry is less than 2% by mass, the production efficiency is lowered, which is not preferable. On the other hand, when the solid content concentration exceeds 27% by mass, a fiber-reinforced cement board may not be obtained uniformly. The adjusted raw material slurry is made to obtain a green sheet. A known method may be used as the papermaking method, and a round netting method, a long netting method, a flow-on method, or the like can be used.
[0015]
The green sheet obtained by papermaking can be pressure-molded as necessary, cured and cured to obtain a fiber-reinforced cement board. When the green sheet is pressure-formed, a fiber-reinforced cement board having a thickness that is difficult to obtain by a normal papermaking method can be obtained by laminating and pressing a plurality of green sheets. The shape of the plate may be a flat plate shape or a waveform shape. As the curing method, known curing methods such as normal curing, steam curing, and autoclave curing can be used. In addition, the obtained fiber reinforced cement board is dried to adjust the moisture content as necessary.
[0016]
【Example】
The following examples further illustrate the method for producing the fiber-reinforced cement board of the present invention.
Example 1
Ordinary Portland cement 50% by weight as cement raw material, cellulose pulp (NBKP) 5% by weight as fiber raw material and 2% by weight PVA fiber (Kuraray vinylon, length 6mm), fly ash (Pacific cement company) as amorphous silica raw material Super flow produced) 22% by mass, and 20% by mass of calcium carbonate powder as a filler were prepared. When adding water to the raw material, 0.14% by mass of sodium gluconate, which is an oxycarboxylic acid-based retarder, is added to the total amount of 72% by mass of ordinary Portland cement and fly ash, A raw material slurry having a solid content concentration of 8% by mass was prepared by mixing. The amount of blended raw material was 600 kg per blend.
Next, the adjusted raw material slurry is made by a round net making machine to obtain a 7.2 mm thick green sheet, which is subjected to pressure molding at a pressure of 21.8 MPa, followed by steam curing at 80 ° C. for 15 hours. And cured, heated and dried at 120 ° C. to adjust the water content to about 10%, cut four rounds to obtain a flat fiber reinforced cement board of width 910 mm × length 1820 mm × thickness 6 mm It was. The papermaking was performed with 5 blends, and the number of fiber reinforced cement boards obtained was 150.
As a result of visually observing the surface of 100 obtained fiber reinforced cement boards, white flower phenomenon was not observed. Moreover, when 20 sheets were tested and constructed as wall materials, problems such as color differences were not recognized. In addition, about the obtained fiber reinforced cement board, as a result of measuring the bulk density and the bending strength based on JIS A 5430, the bulk density is 1.62 g / cm 3 and the bending strength is 31.4 N / mm 2 . It was confirmed that the fiber reinforced cement board had sufficient strength.
[0017]
Comparative Example 1
150 flat fiber reinforced cement boards were obtained on the same conditions as Example 1 except not using a retarder. As a result of visually observing the surface of 100 sheets of the obtained fiber reinforced cement board, 15 pieces of white flower phenomenon were recognized, and one of them was markedly white and had a defect. Moreover, when 20 sheets were tested and constructed as wall materials, some color differences were recognized although they did not correspond to defects. In addition, about the obtained fiber reinforced cement board, as a result of measuring the bulk density and the bending strength based on JIS A 5430, the bulk density is 1.64 g / cm 3 and the bending strength is 31.3 N / mm 2 . No difference in physical properties from Example 1 was observed.
[0018]
【The invention's effect】
According to the present invention, by using an amorphous silica raw material and a retarder in combination, it is possible to easily produce a fiber reinforced cement board that does not easily cause a white flower phenomenon by using a known papermaking method.
Claims (2)
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